diff --git a/scripts/update-tester.php b/scripts/update-tester.php
index 21064b9..117dc63 100755
--- a/scripts/update-tester.php
+++ b/scripts/update-tester.php
@@ -177,14 +177,20 @@ public function testUpdate(
     }
     $updatePackages->run();
 
+    $absoluteDestinationDocroot = DocrootResolver::getDocroot($absoluteDestination);
+
+    // Run "drush cr" before updating code.
+    $drushCmd = $this->task(Drush::class);
+    $drushCmd->dir($absoluteDestinationDocroot);
+    $drushCmd->arg('cache-rebuild');
+    $drushCmd->run();
+
     /** @var \Robo\Task\Composer\Update $composerUpdate */
     $composerUpdate = $this->task(Update::class);
     $composerUpdate->dir($absoluteDestination);
     $composerUpdate->option('no-interaction')->option('no-dev');
     $composerUpdate->run();
 
-    $absoluteDestinationDocroot = DocrootResolver::getDocroot($absoluteDestination);
-
     /** @var \Thunder\UpdateTester\Exec\Drush $drushCmd */
     $drushCmd = $this->task(Drush::class);
     $drushCmd->dir($absoluteDestinationDocroot);